JP2003172201A - Multiple cylinder engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent seizure of a piston and generation of slap noise and the like due to deformation of left and right circumference wall parts 15, 15 of a lower part of a cylinder wall 1 by restraining deformation of the part even high gas pressure is given on the part. <P>SOLUTION: In a multiple cylinder engine forming an intra-cylinder wall by connecting adjacent cylinder walls, thickness of the left and right circumference wall parts 15, 15 of the lower part of the cylinder wall 1 connecting to front and rear of left and right side parts 2c, 2c of a lower part 2b of the intra-cylinder wall gradually increases as the left and right circumference wall part 15, 15 get closer to the left and right side parts 2c, 2c. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a multi-cylinder engine.

[0002]

BACKGROUND OF THE INVENTION The present invention is based on the following technology.
As shown in FIG. 2, adjacent cylinder walls (1) (1) are connected to each other to form an inter-cylinder wall (2), and as shown in FIG. Direction, the cylinder head (4) is up, the width direction of the cylinder block (6) is the left-right direction, and the installation direction of the crankshaft (5) is the front-rear direction. Inter-cylinder bosses (7) and (7) are provided on both left and right sides of (2a).
(7) (7) is connected to both left and right sides of the lower part (2b) of the inter-cylinder wall (2), and the head bolt (8) penetrating the cylinder head (4) is attached to the inter-cylinder boss (7). The inter-cylinder boss (7) and the inter-cylinder wall (2) in the lower part (2
b) An upper female screw portion (9) is provided on one or both sides, and a head bolt (8) is screwed to the upper female screw portion (9) to attach the cylinder head (4) to the cylinder block (6), The bearing wall (10) of the crankshaft (5) is formed in the crankcase of the cylinder block (6), and this bearing wall
(10) is divided into an upper wall portion (10a) and a lower wall portion (10b), and the upper wall portion (10a) is a cylinder block.
Connected to (6), the upper wall boss is on both left and right sides of the upper wall portion (10a).
(11) (11) is provided, and the upper end portion of the upper wall boss (11) (11) is connected to the left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2). , The bearing bolt (12) penetrating the lower wall portion (10b) is inserted into the upper wall boss (11), and the lower portion (2b) of the upper wall boss (11) and the cylinder wall (2)
Provide a lower female screw part (13) over one or both of
A multi-cylinder engine in which a bearing bolt (12) is screwed to the lower female thread portion (13) and the lower wall portion (10b) is assembled to a cylinder block (6).

In this type of engine, the cylinder head (4) is lifted upward and the lower wall portion (10b) is pulled down by the gas pressure generated in the combustion chamber.
The upper female screw portion (9) is lifted upward by the head bolt (8), and the lower female screw portion (13) is pulled down by the bearing bolt (12).

[0004]

2. Description of the Related Art Conventionally, there is a multi-cylinder engine equipped with the above technique. However, in this type of engine, an upper female thread portion and a lower female thread portion are generally formed on the outer wall of the cylinder block.

[0005]

The above prior art has the following problems. << Problem 1 >> The outer wall of the cylinder block easily vibrates.
Since the upper female screw portion and the lower female screw portion are formed on the outer wall of the cylinder block, the outer wall of the cylinder block is stretched by the gas pressure generated in the combustion chamber and easily vibrates. Therefore, the engine noise is increased and the service life of the engine is shortened. In order to solve the above problem 1,
Similar to the present invention, as shown in FIG. 1, the upper and lower female screw parts (9)
It is effective to interpose a cylinder block inner space (17) between (13) and the outer wall (14) of the cylinder block (6). However, in this case, the outer wall of the cylinder block (6)
The gas pressure borne by (14) is applied to both the left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2) and the lower portion of the cylinder wall (1) connected to the front and rear. Left and right peripheral wall (15)
Since it depends on (15), if the thickness of this part is thin,
The following new problems may arise:

<Problem 2> The distortion of the left and right peripheral wall portions near the bottom of the cylinder wall becomes large. When the wall thickness of the left and right peripheral wall parts near the bottom of the cylinder wall is thin, the strain in this part becomes large,
Piston seizure or slap sound is generated.

An object of the present invention is to provide a multi-cylinder engine which can solve the above problems.

[0008]

The constitution of the invention of claim 1 is as follows. In the multi-cylinder engine described in the background of the invention, as shown in FIG.
(9) The cylinder block inner space (17) is interposed between (13) and the outer wall (14) of the cylinder block (6), and as shown in FIGS. Lower part (2
Of the left and right side wall portions (2c) and (2c) of b) and the left and right peripheral wall portions (15) and (15) in the lower portion of the cylinder wall (1) that are connected to the front and rear sides thereof, the left and right peripheral wall portions (15) and (15) are Left and right sides (2c) (2
A multi-cylinder engine characterized in that its thickness is gradually increased toward (c).

[0009]

EFFECT OF THE INVENTION (Invention of Claim 1) The invention of Claim 1 is
It has the following effects. << Effect 1 >> The outer wall of the cylinder block is less likely to vibrate.
As shown in FIG. 1, since the cylinder block inner space (17) is interposed between the upper and lower female screw parts (9) (13) and the outer wall (14) of the cylinder block (6), the outer wall of the cylinder block (6) is (14) is less likely to be stretched by the gas pressure generated in the combustion chamber and less likely to vibrate. Therefore, the engine noise is reduced and the service life of the engine is extended.

<Effect 2> It is possible to suppress the distortion of the left and right peripheral wall portions on the lower side of the cylinder wall. As shown in FIGS. 3 and 4, the left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2) and the cylinder wall (1) connected to the front and rear thereof.
Of the left and right peripheral wall parts (15) (15) near the bottom, the left and right peripheral wall parts
(15) The thickness of the cylinder wall is gradually increased as the left and right side portions (2c) and (2c) are approached, so that the cylinder wall
(1) Even if a large gas pressure is applied to the lower left and right peripheral wall portions (15) and (15), the strain in these portions can be suppressed.
Therefore, it is possible to suppress the seizure of the piston, the slap sound, and the like caused by the distortion of this portion.

(Invention of Claim 2) The invention of Claim 2 has the following effect in addition to the effect of the invention of Claim 1. << Effect 3 >> The strength of the lower part of the inter-cylinder wall can be secured. As shown in Fig. 1, the position of the piston ring at the top of the piston head located at the bottom dead center (1
Since the lowermost edge (20) of the crossing waterway (18) is located at a position higher than 9), the lower part (2) of the inter-cylinder wall (2) is
The height of b) can be sufficiently secured, and the strength of this portion can be secured.

(Invention of Claim 3) In addition to the effect of the invention of claim 1 or 2,
It has the following effects. << Effect 4 >> It is possible to suppress the shear strain in the lower portion of the inter-cylinder wall. As shown in FIG. 1, a pair of head bolts (8) and bearing bolts (12) located above and below,
Since they are arranged on the same axis (29), the tensile force received by the lower portion (2b) of the inter-cylinder wall (2) acts on the same axis (29), and the inter-cylinder wall (2) It is possible to suppress the shear strain of the lower portion (2b). Therefore, it is possible to suppress the seizure of the piston, the slap noise, and the like due to the shear strain in this portion.

(Invention of Claim 4) The invention of claim 4 has the following effect in addition to the effect of the invention of any one of claims 1 to 3. << Effect 5 >> Parts management becomes easy and the parts cost becomes low. As shown in Figure 1, the head bolt (8)
Since the bearing bolts (12) and the bearing bolts (12) are commonly used, the bolts can be easily managed and the procurement cost of the bolts can be reduced.

(Invention of Claim 5) The invention of claim 5 has the following effect in addition to the effect of the invention of any one of claims 1 to 4. << Effect 6 >> The lower part of the inter-cylinder wall can be effectively used. As shown in FIG. 1, the oil supply passage
Since (21) is designed to pass between the upper female screw portion (9) and the lower female screw portion (13), the lower portion (2b) of the inter-cylinder wall (2) is connected to the oil supply passageway (21). It can be effectively used as a forming meat wall.

<Effect 7> It is possible to prevent the cutting dust generated during the screw processing from entering the oil supply passage. As shown in FIG. 1, since the oil supply passage (21) does not communicate with the upper female screw portion (9) and the lower female screw portion (13), chips generated during the screw processing enter the oil supply passage (21). Can be suppressed.

(Invention of Claim 6) The invention of Claim 6 has the following effect in addition to the effect of any one of Claims 1 to 5. << Effect 8 >> The lower portion of the inter-cylinder wall can be effectively used. As shown in Fig. 1, the cylinder wall
(2) Since the shaft hole (23) of the interlocking shaft (22) is inserted between the upper female screw portion (9) and the lower female screw portion (13) at the lower portion (2b) of the inter-cylinder wall. The lower part (2b) of (2)
It can be effectively used as a wall for forming the shaft hole (23).

(Invention of Claim 7) The invention of claim 7 has the following effect in addition to the effect of the invention of any one of claims 1 to 6. << Effect 9 >> Different types of engines can be easily created. As shown in FIG. 1, in order to divide the cylinder block (6) into an upper block portion (6a) and a lower block portion (6b), a plurality of types of lower block portions (6b) are prepared and these are By selectively assembling the upper block portion (6a), it is possible to easily form different engines. For example, a lower block portion (6b) having a wide width standard specification and a lower block portion (6b) having a narrow width tractor specification are prepared, and these are placed in the upper block portion.
By selectively assembling (6a), the standard specification engine and the tractor specification engine can be easily manufactured separately.

(Invention of Claim 8) The invention of claim 8 has the following effect in addition to the effect of the invention of claim 7. << Effect 10 >> It is possible to reduce the load on both left and right sides of the lower portion of the inter-cylinder wall. As shown in FIG. 6, since the lower wall portion (10b) of the bearing wall (10) is connected to the lower block portion (6b), the gas pressure generated in the combustion chamber is lower than that of the inter-cylinder wall (2). Not only the right and left sides of the portion (2b) but also the upper block portion (6a) through the lower block portion (6b). Therefore, it is possible to reduce the load applied to the left and right side portions of the lower portion (2b) of the inter-cylinder wall (2).

<Effect 11> The sealing force of the mating surfaces of the upper and lower block portions is high. As shown in FIG. 6, the lower block portion
Since the lower wall portion (10b) of the bearing wall (10) is connected to (6b), sealing of the mating surfaces of the upper and lower block portions (6a) and (6b) is performed by the block mounting bolt (24) and the bearing bolt (1).
Since it is performed in both 2), the upper and lower block parts (6a) (6
The sealing force of the mating surface of b) is high.

(Invention of Claim 9) In addition to the effect of the invention of claim 7 or 8,
It has the following effects. << Effect 12 >> The rigidity of the cylinder block is high. Figure 4
As shown in FIG. 5, the left and right outer walls of the cylinder block (6)
Since (14) is bent along the outer shapes of the connecting rod (25) and the crank arm (26) passing near the left and right outer walls (14), the rigidity of the cylinder block (6) is high. << Effect 13 >> The sealing force of the mating surfaces of the upper and lower block portions is enhanced. As shown in FIGS. 4 and 5, since the mounting bosses (28a) and (28b) of the block mounting bolt (24) are formed on the inner side wall portion (27) retracted inward, the left and right mounting bosses (28a) are formed. (28b) approach each other, and the sealing force of the mating surfaces of the upper and lower block portions (6a) and (6b) is strengthened. (Invention of Claim 10) In addition to the effect of the invention of any one of Claims 1 to 9, the following effect is exhibited. << Effect 14 >> The left and right peripheral wall portions of the cylinder wall near the inter-cylinder wall can be sufficiently thickened. As shown in FIG. 4, the left and right peripheral wall portions (15) near the bottom of the cylinder wall (1)
Since the increase in the thickness of (15) is started from the front-rear direction central portions (15a) (15a) of the left and right peripheral wall portions (15) (15),
The left and right peripheral wall portions (15), (15) of the cylinder wall (1) near the cylinder wall (2) can be sufficiently thickened. (Invention of Claim 11) In addition to the effect of the invention of any one of Claims 1 to 10, the following effect is exhibited. <Effect 15> The thickness of the left and right peripheral wall portions of the cylinder wall near the inter-cylinder wall can be sufficiently secured. As shown in FIG. 4, both outward facing surfaces (15b) of the left and right peripheral wall parts (15) (15)
Since the (15b) is formed in an outwardly expanding shape from the front-rear direction central portions (15a) (15a) of the left and right peripheral wall portions (15) (15) toward the left and right side portions (2c) (2c), the inter-cylinder wall (2)
The thickness of the left and right peripheral wall portions (15) (15) of the cylinder wall (1) in the vicinity can be sufficiently set. (Invention of Claim 12) In addition to the effect of the invention of any one of Claims 1 to 10, the following effect is exhibited. << Effect 16 >> The thickness of the left and right peripheral wall portions of the cylinder wall near the inter-cylinder wall can be made sufficient, and the cylinder wall can be easily molded. Since the outer surfaces (15b) (15b) of the left and right peripheral wall portions (15) (15) on the lower side of the cylinder wall (1) are formed substantially straight in the front-rear direction,
In addition to the sufficient thickness of the left and right peripheral wall portions (15) (15) of the cylinder wall (1) near the cylinder wall (2),
It also facilitates the molding of the cylinder wall (1).

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. 1 to 6 are diagrams for explaining an embodiment of the present invention. In this embodiment, a vertical water-cooled in-line multi-cylinder diesel engine will be described.

The structure of this engine is as follows.
As shown in FIG. 6, the cylinder head (4) is attached to the upper part of the cylinder block (6), and the head cover (40) is attached to the upper part of the cylinder head (4).
An oil pan (37) is attached to the bottom of (6).

The assembly structure of the cylinder head (4) is as follows. As shown in FIG. 2, adjacent cylinder walls
(1) The inter-cylinder wall (2) is formed by connecting (1) with each other. As shown in FIG. 1, the direction of the cylinder central axis (3) is the vertical direction, the direction of the cylinder head (4) is the upper direction, the width direction of the cylinder block (6) is the horizontal direction, and the installation direction of the crankshaft (5) is the horizontal direction. When viewed in the front-rear direction, inter-cylinder bosses (7) and (7) are provided on both left and right sides of the upper portion (2a) of the inter-cylinder wall (2), and the lower part of the inter-cylinder boss (7) (7) It is continuous with the upper portions of both left and right sides of the lower portion (2b) of the wall of the wall (2).

As shown in FIG. 1, the head bolt (8) penetrating the cylinder head (4) is inserted into the inter-cylinder boss (7), and the inter-cylinder boss (7) is provided with an upper female screw portion (9). A head bolt (8) is screwed onto the upper female screw portion (9) to assemble the cylinder head (4) to the cylinder block (6). The upper female screw part (9) can be formed over one or both of the inter-cylinder boss (7) and the lower part (2b) of the inter-cylinder wall (2).

The assembly structure of the cylinder block (6) is
It is as follows. As shown in Fig. 1, cylinder block
Bearing wall for crankshaft (5) in crankcase (6)
(10) is formed, and this bearing wall (10) is connected to the upper wall portion (10
a) and the lower wall portion (10b), the upper wall portion (10a) is connected to the cylinder block (6), and upper wall bosses (11) (11) (11) (11) are provided on the left and right sides of the upper wall portion (10a). ),
The upper part of the upper wall boss (11) (11) is attached to the cylinder wall (2).
The lower part (2b) is connected to the left and right sides (2c) and the lower part of (2c). Insert the bearing bolt (12) penetrating the lower wall portion (10a) into the upper wall boss (11), and
The lower female screw part (13) is provided in 1), and this lower female screw part (13)
A bearing bolt (12) is screwed onto the lower wall portion (10b) of the cylinder block (6). Lower female thread
(13) can be formed on one or both of the upper wall boss (11) and the lower portion (2b) of the inter-cylinder wall (2).

The measures for the cylinder block (6) are as follows. As shown in Figs. 1 and 2, upper and lower female screw parts
A cylinder block inner space (17) is interposed between (9) and (13) and the outer wall (14) of the cylinder block (6). Therefore, the outer wall (14) of the cylinder block (6) is less likely to be stretched by the gas pressure generated in the combustion chamber and is less likely to vibrate.
Therefore, the engine noise is reduced and the service life of the engine is extended. Further, the left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2) and the lower left and right peripheral wall portions (15) of the cylinder wall (1) connected to the front and rear thereof.
Of the (15), the left and right peripheral wall portions (15) and (15) are the left and right side portions.
(2c) The thickness is gradually increased as it approaches (2c). Therefore, even if a large gas pressure is applied to the lower left and right peripheral wall portions (15) and (15) of the cylinder wall (1), the distortion of this portion can be suppressed. Therefore, it is possible to suppress the seizure of the piston, the slap sound, and the like caused by the distortion of this portion. The cylinder block inner space (17) is an oil draining space and a push rod accommodating chamber. Left and right peripheral wall portions on the lower side of the cylinder wall (1)
(15) Increasing the thickness of (15) is based on the left and right peripheral wall parts (15)
It is started from the central portion (15a) (15a) in the front-rear direction of (15). The left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2) and the lower left and right peripheral wall portions (15) (15) of the cylinder wall (1) connected to the front and rear of the portion (2c). Of these, the outer surface (15b) (15b) of the left and right peripheral wall (15) (15),
The central portion (15a) in the front-rear direction of the left and right peripheral wall portions (15) (15)
It is formed in an outwardly widening shape from (15a) toward both left and right sides (2c) (2c). However, the extent of the spread is slight, and when the cylinder block (6) is viewed from directly below, the outer surfaces of the left and right peripheral wall portions (15) and (15) on the lower side of the cylinder wall (1) are directed outward.
It can be said that the whole of (15b) and (15b) is formed substantially straight in the front-rear direction. Therefore, the left and right peripheral wall portions (15) of the cylinder wall (1) near the inter-cylinder wall (2)
The thickness of (15) can be made sufficient, and the cylinder wall (1) can be easily molded. Generally, the left and right peripheral walls (15)
The central portion (15a) (15a) in the front-rear direction of (15) is a region located equidistant from a pair of adjacent cylinder wall (2) (2), and the pair of cylinder wall ( 2) An area having a front-rear dimension d of D / 3, where D is the distance between the centers of (2). Left and right peripheral walls near the cylinder wall (2)
(15) From the viewpoint of sufficiently securing the thickness of (15), the increase in the thickness of the left and right peripheral wall portions (15), (15) is caused by the central portion in the front-rear direction.
(15a) Start from (15a), but especially from a region located equidistant from a pair of adjacent cylinder wall (2) (2), the front-back dimension of which is less than D / 4 It is preferable to start from a region of less than D / 6, more preferably start from a region of less than D / 8.

As shown in FIG. 1, in forming the transverse water passage (18) in the cylinder wall (2), the position (19) of the uppermost piston ring of the piston head located at the bottom dead center.
The lowermost edge (20) of the crossing channel (18) is located at a higher position. Therefore, the height of the lower portion (2b) of the inter-cylinder wall (2) can be sufficiently secured, and the strength of this portion can be secured.

As shown in FIG. 1, a pair of the head bolt (8) and the bearing bolt (12) located at the upper and lower sides have the same axis line.
(29) It is arranged above. Therefore, the tensile force applied to the lower portion (2b) of the inter-cylinder wall (2) acts on the same axis (29), and the shear strain of the lower portion (2b) of the inter-cylinder wall (2) is applied. Can be suppressed. Therefore, it is possible to suppress the seizure of the piston, the slap noise, and the like due to the shear strain in this portion. Further, the head bolt (8) and the bearing bolt (12) are made common. Therefore, the bolts can be easily managed and the procurement cost of the bolts can be reduced.

As shown in FIG. 1, when forming the oil supply passage (21) in the lower portion (2b) of the inter-cylinder wall (2), the oil supply passage (21) has an upper female screw portion (9). And the lower female screw portion (13) are not communicated with each other, but pass between them. Therefore, the cylinder wall (2)
The lower part (2b) can be effectively used as a meat wall for forming the oil supply passage (21). Further, it is possible to prevent the cutting dust generated during the screw processing from entering the oil supply passage (21). Further, in the lower portion (2b) of the cylinder wall (2), the upper female screw portion (9) and the lower female screw portion (1
The shaft hole (23) of the interlocking shaft (22) is inserted between the shaft hole (23) and (3). For this reason, the lower part (2
b) can be effectively used as a wall for forming the shaft hole 23. This interlocking shaft (22) is a valve operating cam shaft.

As shown in FIG. 1, the cylinder block (6)
Can be divided into an upper block portion (6a) and a lower block portion (6b), and the lower block portion (6b) can be attached to the upper block portion (6a) by a block attaching bolt (24). Therefore, the lower block part (6
By preparing b) and selectively assembling them on the upper block portion 6a, it is possible to easily make different engines. For example, by preparing a lower block portion (6b) having a wide width standard specification and a lower block portion (6b) having a narrow width tractor specification, and selectively assembling these to the upper block portion (6a),
It is possible to easily make a standard engine and a tractor engine separately.

As shown in FIG. 1, the lower block portion (6b)
Is connected to the lower wall portion (10b) of the bearing wall (10). Therefore, the gas pressure generated in the combustion chamber is the left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2).
Not only the lower block portion (6b) but also the upper block portion (6a) is loaded. For this reason, the cylinder wall
(2) It is possible to reduce the load on the left and right side portions (2c) (2c) of the lower portion (2b). Moreover, since the mating surfaces of the upper and lower block portions (6a) and (6b) are sealed by both the block assembly bolts (24) and the bearing bolts (12), the mating surfaces of the upper and lower block portions (6a) and (6b) are Has a high sealing power.

As shown in FIGS. 4 and 5, the connecting rod (25) and the crank arm (26) passing through the left and right outer walls (14) of the cylinder block (6) near the left and right outer walls (14).
It is bent along the outline of. Therefore, the rigidity of the cylinder block (6) is high. Also, the left and right outer walls (14)
Among them, the upper and lower mounting bosses (28a) (2) of the block assembling bolt (24) are attached to the inner wall portion (27) retracted inward.
8b) is formed. Therefore, the left and right mounting bosses (28
a) (28b) approach each other and the upper and lower block parts (6a)
The sealing force of the mating surface of (6b) is strengthened.

As shown in FIG. 6, the lower block portion (6b)
Lower mounting boss that allows the block mounting bolt (24) to pass through
When forming (28b), this lower mounting boss (28b)
The lower opening is opened in the lower block portion (6b) or in the oil pan (37). Therefore, the bottom mounting boss
The oil that has entered the boss hole of (28b) returns to the inside of the oil pan (37) through its lower opening and does not leak outside the engine. When sealing the mating surfaces of the upper and lower block portions (6a) and (6b), an adhesive may be applied to the mating surfaces, but oil may enter the boss holes of the lower mounting boss (28b). However, since oil does not leak to the outside of the engine, it is not necessary to apply adhesive around the entire upper opening of the lower mounting boss (28b). Therefore, it does not take time to seal the mating surfaces of the upper and lower block portions.

The mounting structure of the oil level gauge (31) is
It is as follows. As shown in FIGS. 5 and 6, the insertion boss (32) for the oil level gauge (31) is arranged in the recessed space (30) facing the inner wall portion (27) from the outside. . Therefore, the width of the cylinder block (6) can be reduced. Further, the insertion boss (32) of the oil level gauge (31) is arranged on the side of the bearing wall (10) of the crankshaft (5). Because of this, the rotating crank arm
The oil level gauge (31) can be inserted into the left and right central portions of the oil pan (37) while avoiding the (26) and the connecting rod (25). Therefore, the oil level can be accurately detected even if the engine is tilted to the left or right.

As shown in FIG. 5, an oil level gauge
The unpierced boss meat portion (33) for forming the insertion boss (32) of the (31) is formed in the recessed space at a plurality of locations on the left and right outer walls (14).
It is placed in (30). Therefore, the mounting position of the oil level gauge (31) can be selected. Further, the rigidity of the cylinder block (6) is increased.

Another structure for strengthening the rigidity of the cylinder block (6) is as follows. As shown in FIG. 3, a side water passage (34) is provided along one of the left and right outer walls (14) of the cylinder block (6) along the front-rear direction, a water jacket (16) is provided in the cylinder block (6), and The cooling water from the water jacket (1
As shown in FIG. 6, a part of the outer wall (14) of the cylinder block (6) is curved outwardly to bulge out, and a side water channel (34) is formed inside the outer wall (14). . When the balancer shaft accommodating chambers (35) (36) along the front-rear direction are provided on both the left and right outer walls (14) of the cylinder block (6), a part of the outer wall (14) of the cylinder block (6) bulges outward. It is curved into a shape and the balancer shaft accommodating chamber (35) (36)
Is formed. In the balancer shaft accommodating chambers (35) (36),
It houses the secondary balancer shafts (38) (39).

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a cylinder head of a cylinder block of an engine according to an embodiment of the present invention.

FIG. 2 is a plan view of a cylinder block of the engine according to the embodiment of the present invention.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along line VV of FIG.

FIG. 6 is a vertical cross-sectional front view of the engine according to the embodiment of the present invention.

[Explanation of symbols]

(1) ... cylinder wall, (2) ... cylinder wall, (2a) ... upper part, (2b) ... lower part, (2c) (2c) ... left and right side parts, (3) ... cylinder center axis , (4) ... Cylinder head, (5) ... Crank shaft, (6) ... Cylinder block, (6
a) ... upper block part, (6b) ... lower block part, (7)
... bosses between cylinders, (8) ... head bolts, (9) ... upper female screw portion, (10) ... bearing wall, (10a) ... upper wall portion, (10
b) ... lower wall part, (11) ... upper wall boss, (12) ... bearing bolt, (13) ... lower female screw part, (14) ... outer wall, (15) ... cylinder wall lower left and right peripheral walls, ( 16) ... water jacket, (17) ... internal space of cylinder block, (18) ... transverse water channel, (19) ... position of top piston ring, (2)
0) ... bottom edge of crossing waterway, (21) ... oil supply passage, (2)
2) ... Interlocking shaft, (23) ... Shaft hole, (24) ... Block mounting bolt, (25) ... Connecting rod, (26) ... Crank arm, (27) ... Inner wall part, (28a) (28b) ... Upper and lower mounting bosses for block mounting bolts.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Wataru Iwanaga             3-8 Chikko Shinmachi, Sakai City, Osaka Prefecture             Bota Sakai coastal factory (72) Inventor Makoto Watanabe             3-8 Chikko Shinmachi, Sakai City, Osaka Prefecture             Bota Sakai coastal factory F term (reference) 3G024 AA21 AA28 AA33 AA37 AA38                       BA02 DA18 DA26 FA00 FA05                       FA06 FA07

Claims (12)

[Claims] 1. A cylinder wall (2) is formed by adjoining adjacent cylinder walls (1) (1) to each other, and the cylinder center axis (3) is oriented vertically, and the cylinder head (4) is oriented toward the cylinder head (4). And the width direction of the cylinder block (6) as the left-right direction, and the installation direction of the crankshaft (5) as the front-rear direction, and between the cylinders on the left and right sides of the upper part (2a) of the inter-cylinder wall (2). Bosses (7) (7) are provided, and this cylinder boss (7)
(7) is continuous with the left and right side parts (2c) (2c) of the lower part (2b) of the cylinder wall (2), and the head bolt (8) penetrating the cylinder head (4) is inserted between the cylinder bosses. (7) is inserted into the boss (7) between the cylinders and the lower portion (2b) of the wall (2) between the cylinders, and an upper female screw portion (9) is provided on the upper female screw portion (9). Screw the head bolt (8) to the cylinder head (4) and assemble it to the cylinder block (6).
A bearing wall (10) of (5) is formed so that the bearing wall (10) can be divided into an upper wall portion (10a) and a lower wall portion (10b), and the upper wall portion (10a) is divided into cylinder blocks (10a). 6), the upper wall boss (11) on both left and right sides of the upper wall portion (10a)
(11) is provided, and the upper wall bosses (11) (11) are provided on both left and right side portions (2c) (2c) of the lower portion (2b) of the inter-cylinder wall (2).
The bearing bolt (12) which is continuous with the lower wall portion (10b) and is inserted into the upper wall boss (11), and the lower portion (2b) of the upper wall boss (11) and the cylinder wall (2). ) One or both,
In a multi-cylinder engine in which a lower female screw portion (13) is provided, a bearing bolt (12) is screwed to the lower female screw portion (13), and the lower wall portion (10b) is assembled to the cylinder block (6), Outer wall of female thread (9) (13) and cylinder block (6)
Cylinder block inner space (17) is interposed between (14) and both left and right sides of lower part (2b) of inter-cylinder wall (2)
(2c) (2c) and the left and right peripheral wall portions (15) (15) of the cylinder wall (1) connected to the front and rear of the front and rear sides of the cylinder wall (1), the left and right peripheral wall portions (1)
5) A multi-cylinder engine characterized in that the thickness thereof is gradually increased as the left and right side portions (2c) (2c) are approached. 2. The multi-cylinder engine according to claim 1, wherein when forming the transverse water passage (18) in the inter-cylinder wall (2), the position of the uppermost piston ring of the piston head located at the bottom dead center. Crossing channel (18) higher than (19)
The multi-cylinder engine characterized in that the lowermost edge (20) of the is located. 3. The multi-cylinder engine according to claim 1 or 2, wherein the head bolt (8) and the bearing bolt (12) are located above and below.
A pair of are arranged on the same axis (29),
A multi-cylinder engine characterized by that. 4. A multi-cylinder engine according to any one of claims 1 to 3, wherein the head bolt (8) and the bearing bolt (12) are made common. 5. The multi-cylinder engine according to any one of claims 1 to 4, wherein the oil supply passage (21) is formed in the lower portion (2b) of the inter-cylinder wall (2), the oil Supply passage (21)
However, the multi-cylinder engine is characterized in that the upper female screw portion (9) and the lower female screw portion (13) are allowed to pass between them without communicating with each other. 6. The multi-cylinder engine according to any one of claims 1 to 5, wherein an upper female screw portion is provided at a lower portion (2b) of the inter-cylinder wall (2).
Between the (9) and the lower female screw part (13), the shaft hole of the interlocking shaft (22)
A multi-cylinder engine characterized by having (23) intruded. 7. The multi-cylinder engine according to claim 1, wherein the cylinder block (6) can be divided into an upper block portion (6a) and a lower block portion (6b), and a lower block is provided. Part (6
b) with the block mounting bolt (24)
A multi-cylinder engine characterized in that it can be installed in a). 8. The multi-cylinder engine according to claim 7, wherein the lower block portion (6b) includes a lower wall portion of the bearing wall (10).
A multi-cylinder engine characterized by connecting (10b). 9. The multi-cylinder engine according to claim 7 or claim 8, wherein a connecting rod (14) passing through the left and right outer walls (14) of the cylinder block (6) near the left and right outer walls (14). 25) and the crank arm (26) are bent along the outer shape of the left and right outer walls (14) of which the inner wall portion (27) is retracted inward.
The block mounting bolt (24) mounting boss (28a)
A multi-cylinder engine characterized in that (28b) is formed. 10. The multi-cylinder engine according to any one of claims 1 to 9, wherein left and right peripheral wall portions (15) (15) of the cylinder wall (1) are located below the cylinder wall (1).
A multi-cylinder engine, characterized in that the increase in the thickness of the engine is started from the front-rear direction central portions (15a) (15a) of the left and right peripheral wall portions (15) (15). 11. The multi-cylinder engine according to any one of claims 1 to 10, wherein the cylinder block (6) is viewed from directly below, and the lower portion (2b) of the inter-cylinder wall (2) is Of the left and right side wall parts (2c) (2c) and the left and right peripheral wall parts (15) (15) at the bottom of the cylinder wall (1) connected to the front and rear thereof, the left and right peripheral wall parts
(15) The outward facing surfaces (15b) and (15b) of (15) are formed by the central portions (15a) and (15) of the left and right peripheral wall portions (15) and (15) in the front-rear direction.
It is characterized in that it is formed in an outwardly expanding shape from a) toward both left and right ends (2c) (2c). 12. The multi-cylinder engine according to any one of claims 1 to 10, wherein when the cylinder block (6) is viewed from directly below, the left and right peripheral wall portions (15) at the lower side of the cylinder wall (1). (15)
A multi-cylinder engine, characterized in that both of the outward facing surfaces (15b), (15b) are formed substantially straight in the front-rear direction.